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    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    
</head>
<body>
    <div class="light">

    </div>
    <p>做一些简单更改</p>
    <button id="open">开灯</button>
    <button id="close">关灯</button>
    <script src="./jQuery.js"></script>
    <script src="./index.js"></script>
</body>
</html>